Paper-stock-screening machine.



A. R.'PAULL. n PAPER STOCK SCREENING MACHINE.

'APPLICATION FILED APR. 17. 1914.

Patented Aug. 1o, 1915.

2 SHEETS-SHEET l.

mess@ A. R. PAULL.

PAPER STOCK'SCREENING MACHINE. APPLlcAlovumE'n APR. u, 1.914.

Patented A ug. 10, 19l5 nvm n1 PAULL, 6r MONTREAL, QUEBEC, CANADA.

I rAPER-srocx-SCREENING MAcHINE.

Specication of ietters Patent. Patented Aug. 10, 1915.

Application filed April 17, 1914. Serial No. 832,599.

To au 'whom it may concern:

Be it known that I, ARvIN R. PAULL, a

citizen of the UnitedfStates, residing at the city of Montreal, in the Province of Quebec and Dominion of Canada, have inventedceri tain new and useful Improvements in Paper- Stock-Screening Machines, of which the following is a full, clear, and exact description. This invention relates to improvements 1n screens -for paper stock and like. material,

and the object is to provide a simple, durable and compact machine for removing splinters, sand', and foreign material from paper pulp before it is ing machine.

A further object is to provide a lighter andA morecompact machine having larger screening capacity and higherl screening elticiency than machines at presentv in gen1l eral use.

A still further object is to provide a screening device in which the vibration and consequent noise are retained as much as possible in the machine itself.

The diaphragm screens at present in general use consist of a series of horizontal screens which are vibrated by means of a cam shaft located beneath. The vibration of the diaphragm operates to draw the'material passed into the paper makthrough the perforations or slots thereof,

the foreign matter being held back. These screens are set out'in a row and the flow of material passes thereover, a portion being drawn through each screen. These machines are extremely heavy and cumbersome.

In the present invention, a polygonal cage is formed between the bars of which the `Iscreen plates are mounted. This screen cage is revolubly mounted upon a slowly revolving shaft, provided with .a cam which en-A gagesr shoes coperating with the spindles of a series of plunger plates orpistons. The action of the'camdmparts a vibrating or reciprocating motion to the plunger plates, and the paper stock is forced or sucked through thesuperposed and relatively stationary screen plates. -Means are provided for conveying the splinters, sand. etc.. to a' ,isfan enlargement vof the central portion of Fig. 3 showing the throw of thecam exaggerated. Fig. 5 is a half plan View of one of the screening plates.

Referring more particularly to the drawings, 11 designates a cylindrical casing, mounted on legs 12 and provided at the to with a suitable opening 13 parallel with the axis. One end 14 of the casing is preferably solid, while the other end 15 is provided with a large inspection opening-16 in the upper part thereof, and with a small discharge opening 17 in the lower part. At each end of the casing, bearings 18 are provided.

.Within the casing, a cage -is located consisting of polygonal spoked end members 19 connected by radially disposed separating blades 20, arranged longitudinally parallel with the axis of the cage. These blades 2O are secured to the end members 19 at theA junctions of the faces thereof, as will be clearly seen. from the drawings. Each of the end members 19 is provided with a circular fiange 21 near the periphery thereof, which abuts similar flanges 22 formed on the inner sides of the casing ends. A circular packing ring 23 is provided surrounding the iianges :21 and 22, and forming therewith a. suHiciently tight joint to prevent the passage of the paper stock between the casing and cage ends. The cage is rigidly mounted on al hollow shaft 24 which revolves in the bearings 18 and 19 and is driven at suitable speed by means of a pulley 25 or any suitable gearing. The shaft 24 is enlarged midway between the ends of the cage to form a c vlindrical cam box Q6. Av solid shaft 27 driven. at comparatively high speed by `means of a pulley 28 or other suit-able arrangementmasses through the hollow shaft 24 from end to end. Mounted. on the shaft 27 within the cam box 26 is a small cam 29 'having a pluralit;7 of very slight throws.

This cam is shown much exaggerated in Fig.

4 as having three throws or projecting portions,- but this number may be varied as desired. The throw of this cam isvery small, being in reality only about three-sixteenths ofan inch for a cage of six vfeet or more diameter.

Between the partition blades 20 of the cage. rectangular plungers orpistons -are provided. each plunger plate occupyingthe space from one blade to the nextand'pref erably from end plate to endfplate of the cage.,v The plunger plates;-80ffare `Aeach A from the axis ofthe cage.

mounted on a radial spindle Iwhich passes into thecam boX 26 through stu .ing boxes 33. Each spindle is provided 'with a head 34 having a removabley shoe 35 pressing" provided with perforations" or slots, 320i suitable'size andshape. In some instances, elongated'slots such as shown in Fig. 5 will be preferred, while-in other instances much. shorter'perfor'ations ,which maybe circular are preferred.' f f l ,Y

1t lwill be' lnoted in Figs. 1 and `3 ofthe drawingsthat the screen cage'is .mounted eccentrically Within the cas'inglL the ccentricity being in a horizontal direction. Each of. the separatingblades 20 is provided. with a scraper 38 prejecting beyond the cage. As the screen cage revolves, theI Scrapers grad- ',ually approach the casing untilt-heycome into Contact therewith, as clearly .shownin Fig. 3. The Splintersffand other foreign matterwhich h'avebeen separated romthe pulp are thus carriedr upwardly against one side of the Casin@nr to a suitable point where a flush pipe 39 is provided in' one end of the vcasingr and a drain pipe 40 inthe other end.

A rush of Water is thus maintained over the surface of each plate, as it passes .this point so that all foreign. matter is kcarried away by the water. To insure absolute cleaning of the screening plates, a spray pipe p41 islen cated above the openaingl?) and water is 4sprayed over the entire surface of the plate.

which is'thus washed clean and. cleared of any particles of stock Vremaininginthe perforations thereof.

PaperI stockto be screened is delivered into the casing, for instance, through the- 'aperture 13, and approximately' iills' the space between the casing.' and the screen plates. Asthe screening cage revolves, this paper stock is carried around by the scrapers 38 into the constantly narrowing space caused by' the eccentricity of thev cage 'and casing'. During this movement, which results in a very slight compression of the stock, the rapidly revolving cam successively engaging the shoes ofthe several spindles 3l'` causes the plungers to have a vibratmg or reciprocating movement toward and away During the outward movement of each vplunger, a small amount of stock may be Aforced through the perforationsfofthe screen plates so that such pcrforations are prevented from clogging.

Duringr the return movement of the plungers, the pulp stock is sucked through the -Lisanne screen plates into the space between said plates 'and the plunger-s. In this way, each successive vibration of the plungers forces or sucks a little more pulp through, so that the interior of the cage becomes partially filled with the screened stock, which isdischarged through the aperture 17. The paper stock iills whatever space there 'is be-` tween the edges of the plunger plates and the blades and -cafe ends, and acts as a seal so. that the sucking or forcing-action ofthe plungers is not hampered by leakage around the edges. The splinters. sand and other foreign matter which cannot pass through the perfor-ations of the screen plates, remain outside, and are carried by the Scrapers 38 .to the flushing point, as previously described.-

In practice, the cage -is preferably operated at about one revolution per minute or a trifle faster, while the cam shaft turns ap:

proximately two hundred revolutions a min-,

ute. These speeds may, however, be varied according to the quality of stud' treated and the completeness of Vthe screening required. The shape of the cam in a large measure opf posesfthe vibrations to one another, andthe nature ef the machine' centers all these vibrations at the axis of the rotor, so that only a minimum of vibration is transmittedto the building in which the machine is installed. Tne rotating cage Vcarries the stuff around with it, so that screening, is accomplished much more rapidlytha'n when the 'o 1 0 stuff merely runs over the screens. Furthermore, thel vibrating` action of the plungers tending to draw or force material through the perforated screens adds greatly to therapidity and effectiveness of the machine. fo'insure smooth running, and minimize'the noise and the vibration, the cam boX 26 may be filled with heavy oil or grease, which is prevented from leaking out .and Amingling with the stock by the stuffing boxes y,This i oil may also be led through grooves of Well lubricate the cam shaft 27." l

While the device has beenshown with screen plates,extending'fromV end to end of the cage,it is obvious that as many plates `may be Aused in thislength as desired, and each seriesof plates thus formed operated bywits own cam. In the same wayflong blades may be operated at each end by means of two cams. Various other vmechanicalchanges may be made Without departing,r

'known design in the hollow shaft'24 so as to l from the spirit ofthe invention, whiclris not limited to the particular form shown'.

Having thus described my invention, what ,1 claim is 2- v`1. A device of the character described, comprising a casing, an eccentrieally mountV edcage Within the casing, a series'offs'ubf stantially fiat screens mounted' on the circumference .of said cage, and a series of 1nmesses termitentiy operating plungers mounted within incl efijecen. io seid screens.

Q. device of he character described, comprisinq n easing, :in eweiirieellj/ monili;- efl rotaine; screen esige therein, e series of 5st screening plates mounte en ille circumference of seid cage, e. seriescf istermitiently operating plungers mounted Wihin said cage edjacen elle screening plates, and means for imparting e successive, intermittent motion te seid plungerse l 3. A deice of the character described, comprising a casing, e roating cage herein, a series of separating bars mounts@ in said cage, e series of Har screen pistes ixecl between seid separating bars, enel e series the screening plates.

4. A device of the character .escrilied,

vibrating piangere meunier?, wit'hiri and afljacent the sci-reen plates, arid means for imparting successive, intermiiqtent motion te seid plunger".

5. A device ef ne character described, comprising e cesisg, e rotating screen cage therein vibrating `plungers mounted in said screesi cage, and Scrapers carried by the screen cage arranged to circulate material eolie screened wiliinthe casing.

6.' A device of the character described, ccmprising e casirrg, en eccentrieelly mounted cage Within the-casing, e series of screens mounted in seid cage, e series of radially disposer?, rigid stemmed piangere mounted adjacent seid screens enel radially movable.

7. A device of lie character described, comprising e casing, an eccenrically disposed screening mechaeism revoiubie therein, iiiermittently vibrating piangere in seirl screening mechenisin, screpers carried h1; said screening mechanism edape to circulate tire material to be screened, and means for mainibeining a flow of water across the screen plates.

8. A device of elle character describefl, comprising a resine, a screen cage revoiubly mounted therein, a plurality or perforated screen plates secured dependenly mov low' said plates, enel e eem adapted to inter'uiteiitiy reciprocate said plunges ,W2-'lh respect to the perforated plates.,

device oitlie charecer described cemprisin e' cnsingen eccenrieeliymermeed 'cage wthiri rire casing, series ei screeee of plungers mounted Within and adjacent i piangere and revelubly in said screen cage, inable plungers meuned l tile cage, e secondv sllzift mounted within lire hollow shaft, e cam mounted on said inner shaft, and spindles supporting seid plunger-s and engaging seid eeen.

' El. in :i rievice offrire charset-er described, the coiribinetion with easing, revelubly ,mermecl therein, e. plurality 01' superpeseci perifereefiletes mmmed on said cage and forming ogeleer a' polygonal screen, means fer vibrziing said plungersinciepeiidenlgg and meses for cleaning the foreign metter from lie surface of said plaies. v

l2. A device of the characer errelied, comprising e casing, a cage therein, e ureliy of independently movable piangere and staticnery screen plaies. mounted on said cage and forming a substantially cylindricei screen, Scrapers carried by the cage intermeiate seiri plates errang-ed to transport meieriai te loe screened, e hollow shaft supperting said cage, a solid cam shaft Within said liellcw shaft, spindles carried by sai plungers engaging seid` cam slie, means for hel-:ling said spindles in engagement with ille cem shaft whereby vibraory metier. will be imparied to seid piangere, ineens Aior supplying material to lie screened imc the annuler space between the screen ami cesing, means for removing materiel l@esseri iireugii iie screen from ille iierier of the cage, means for 'washing away maeriel noi; 'passed Witness l:

. is. sieeiese.

through thescreen, and means for Washing ebstructiorisA cuiI of the screen.

1Q, A device of the character describe@ comprising e. casing, nn eccentrically mourrir? of s cage.

"ire

lie 

